<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <script src="https://cdn.jsdelivr.net/npm/vue@2.6.10/dist/vue.js"></script>
</head>
<body>
  <div id="app">
    <input ref="myInput" v-if="isShow" type="text"> &nbsp;&nbsp;<button @click="addKeyword">创建关键字</button>
  </div>
</body>
<script>
  var vm = new Vue({
    el:"#app",
    data:{
      isShow:false
    },
    methods:{
      addKeyword(){
        // 异步
        this.isShow = true
        // setTimeout(() => {
        //   // console.log("11111")
        //   // this.$refs.myInput.focus()
        // }, 10);

        this.$nextTick(function(){
          this.$refs.myInput.focus()
          console.log("2222222222")
        })
      }
    }
  })
</script>
</html>
